The phrase "a significant favourable effect" is correct and usable in written English.
It can be used in contexts where you want to describe a notable positive impact or outcome of a particular action or event.
Example: "The new policy has had a significant favourable effect on employee morale and productivity."
Alternatives: "a considerable positive impact" or "a marked beneficial effect."
A psycho-educational program for family carers was demonstrated to have a significant, favourable effect on carers' perceptions of the positive elements of their role [ 28].
A recent study [ 29] showed that supplementation either with zinc plus multi vitamin and mineral (MVM) or MVM alone in 96 patients with T2D resulted in a significant favourable effect on blood glucose parameters.
The same factors had a significant effect on survival of the leukaemia patients, except for treatment at an SOC, which had a significant favourable effect on survival of acute lymphoblastic leukaemia (ALL) patients only.
At follow up there was a significant favourable effect of training on knowledge about people with mental illness and stigma with an adjusted mean difference of 1.19 (95%CI 0.63-1.76) (comparing the two interventions combined with control), but no evidence for a difference between the two different types of intervention).
Meta-analyses of longer term effects indicated an overall significant favourable effect of the intervention on all outcomes at the end of follow-up (combined odds ratio 1.36 (1.07 to 1.71) for function, relative risk 0.84 (0.72 to 0.99) for nursing home admission, relative risk 0.87 (0.77 to 0.97) for mortality).
In contrast, when relative survival is considered, age shows a weak, but statistically significant, favourable effect – a sort of mild protection.
Nine trials reported at least one (significant) favourable effect and 6 trials reported no effects.
Previous studies have evaluated different long-term care models for stroke patients, but only a few have shown significant favourable effects [ 7, 8].
Although the results showed that the intervention had a favourable effect on the levels of social activities of stroke patients, no significant favourable effects between the intervention and control group were found regarding quality of life, activities of daily life, depression and anxiety, or caregiver strain [ 12].
Furthermore, both weight loss interventions resulted in significant favourable effects on oestradiol, free oestradiol, androstenedione (exercise only), free testosterone and SHBG compared with the control group.
25 26 In our study, however, we found no significant favourable effects for these outcomes, possibly because our patients showed low average levels of depression and fatigue at baseline.
